Pipe clamp or dog



July 5, 1932. BANNAN 1,866,075 I PIPE CLAMP OR DOG Filed June 27, 1931 INVENTOR.- 4m wig-44 ATTORNEY Patented July 5, 1932 Y GEORGE BANNAN, OE H ARRISON, NEBRASKA PIPE CLAMP 01B; DOG

Application filed June 27,

This invention relates to pipe clamps or dogs.

The main object of the invention is toprovide a clamp or dog for engaging and holding well pipes and the like when pulling the same from wells or lowering them into the wells, the clamp being so constructed as to be readily mounted on the pipe and to firmly and tightly grip the same during the above operations.

Another objectds to provide a pipe clamp or dog com rising two pivotally connected sections having outwardly bulged or curved portions adapted to fit loosely around a pipe when the said sections are swung together, one section having a hook to engage the other and hold the clamp closed around the pipe and one section having an attaching ring at its end to receive the raising or lowering cable.

A further object is to provide a device of this kind in a simple, durable, etlicient and inexpensive form.

With these and other objects in view as will appear hereinafter, the invention resides in the novel construction and arrangement of parts as hereinafter set forth and claimed, reference being bad to the accompanying drawing wherein Figure 1 is a perspective view of the clamp.

Figure 2 is a side view thereof.

Figure 3 is a side view, reduced in scale, illustrating the application of the clamp to a pipe.

Referring now more particularly to the drawing,.the invention comprises two clamping bars or jaws 1 and 2 each folded back on itself at one end as shown at 3 and pivot- .ally and loosely connected at these ends by a bolt 4 passing through the ends as shown. At a point adjacent these pivotally connected ends the bars 1 and 2 are each bulged or curved outwardly as shown at 5 so that a substantially circular passage 6 is provided through the clamp when the bars are swung together as shown in Figure 1. It will be noted however that the bar 1 is bulged out ward a substantially greater distance and to a greater curvature than the bar 2 for a reason to be described. The bar 1 has an aper- 1831. Serial No. 547,243.

ture 7 adjacent its free end through which.is mounted a cable attaching ring 8. The bar 2 is somewhat shorter than the bar 1 and terminates at its freeind short of the end of this bar, the said bar 1 being gradually reduced or tapered towards its free end and having a book 9 bent upwardly and then downwardly. Th'is hook 9 ma thus fit or set astraddle of the upper edge 0 the bar 1 and so hold the two bars against swinging laterally apart at their free ends, when they are closed as shown and yet allow the bar 2 to be swung upward on-its pivot at the bolt 4.

In use the bar 2 is swung upward to a point substantially at right angles to the bar 1 as shown in the dotted lines in Figure 3 and the bulged portion 5 of the bar 1 is brought into engagement with the pipe A to be lifted or lowered. The bar 2 is then swung back downward alongside the bar 1 to the closed position and the operating cable B is attached to the ring 8. An upward strain on the cable B will swing the clamp as a whole to an angular or inclined position as shown causing opposite u per and lower margins of the passage 6 ormed through the clamp to bear against the pipe and grip the same so that it may be lifted. The weight of the pipe itself will cause the same action to result in the lowering of the pipe as will be understood. The passage 6 formed by the outwardly bulged portions 5 of the two clamp bars is of course sufiiciently larger than the pipe A to allow this play of the clamp on the pipe. The clamp may be readily removed from the pipe A by swinging the bar 2 upward, the aforesaid formation of the bar 1 with a greater bulge or curve than the bar 2 allowing the latter to swing up alongside and clear of the pipe as will be apparent. The pivotal con nection of the ends of the bars by the bolt 4.- is preferably suificiently loose to allow the necessary lateralplay or swinging apart of the bars toaccomplish the above action. It is obvious that the clamps may be made in any size desired and that they will provide a firm and safe grip upon the pipe being lifted or lowered. The innersurfaces or faces of the bulged portions 5 of the clamp may be go a hook'on the ribbed or knurled to aid in gripping the pipe if so desired.

While I have hereinset forth a certain preferred embodiment of my invention it is understood that I may vary from the same in minor structural details so as best to construct a practical device for the pur see intended, not departing from the spirit of the invention and within the scope of the append- 10 ed claims.

Iclaim: 1. In a device of the kind described, a pair of elongated clamping bars of flat material folded back on themselves at one end, a bolt passed through these folded ends of the bars and pivotally connecting the same for movement apart in vertical'parallel planes, the said bars having outwardly bulged portions adjacent their ivotally connected ends, and t i'ee end of one bar ada ted to fit over and set astraddle the other ar. 2. In a device of the kind described, a pair of. .elongated clamping bars of flat material, one bar being shorter. than the other, 'a bolt passed through one end of each bar and pivotally connectin the two, the bars having outwardly bulge portions intermediate their 'ends, ahook formed on the end of the shorter bar and adapted to straddle the edge of the 30 other bar, and a cable attaching ring secured to the end of the longer bar;

In testimony whereof I afiix my si ature. GEORGE BAN AH. 7 

